Fonts: a text is as tall as its font says

- New paragraph Height: the line height comes from the font, not
  from Pixi's sample string, so descenders are no longer cut.
- Known limits no longer says the frame of a text is estimated.
- Development counts 2067 checks.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Development.md

@@ -21,7 +21,7 @@ php tests/php/releases.test.php                               # the release stor
 php tests/php/files.test.php                                  # uploaded files in a folder per account (#344), the same way
 php tests/php/videos.test.php                                 # the video store, its queue and the worker (#402), with the
                                                               #   real ffmpeg: the CI image and feuerwerk-video have it
-node tools/seed-e2e.mjs && node tools/e2e.mjs                 # 2066 editor checks, screenshots in /tmp/gm-e2e-*.png
+node tools/seed-e2e.mjs && node tools/e2e.mjs                 # 2067 editor checks, screenshots in /tmp/gm-e2e-*.png
 GM_STEPS=20 node tools/e2e.mjs                                # or 1-12, or 6,20 — a subset while working on one step
 ./e2e.sh start [GM_STEPS]                                     # the same run detached, see below
 ./e2e.sh status                                               # live progress, or the last run's result

Fonts.md

@@ -43,6 +43,14 @@ so a text of ten characters grows by nine times the value. Negative draws them c
 how a design's tracking in em carries over: -0.03em at a font size of 216 is -6.5. The spacing
 counts into the text's footprint, so selecting, picking and "Add collider" follow it.
 
+**Height.** A text has no height row: it is as tall as the line box its face declares (the
+browser's `fontBoundingBoxAscent` + `fontBoundingBoxDescent`, which is where the face says a
+line begins and ends), each further line one Pixi line lower. Pixi on its own makes a line only
+as tall as `|ÉqÅM` reaches and cuts off whatever reaches further: the tail of Manrope's "g" is
+0.015em deeper than its "q" and was cut flat. Where Pixi's box is the taller one, it is kept. So
+the height does not change with what is typed, and a glyph only loses ink if it reaches beyond
+the face's own metrics. By Manrope's font file, a line is 1.366em instead of 1.25em.
+
 **Filter.** A font asset has one row, **Filter**, the same as a texture's: **Linear** (the default)
 draws the glyphs smooth and renders them again, sharper, as the view zooms in. **Nearest** is for
 pixel fonts: the glyphs end up at one texel per world unit and are magnified without smoothing,
@@ -66,8 +74,10 @@ of "Regular" cannot then fight over one family, and the same bytes always resolv
 face. The name *inside* the file is not read at all — the asset's name comes from the uploaded
 file name and is yours to change.
 
-**Known limits.** The selection box and the click area of a text are still estimated from the
-character count (`bounds.ts`, `CHAR_WIDTH`), not measured, so a very wide or very narrow face
-sits inside a box that does not quite fit it. Only text objects wear fonts; a sprite has no use
-for one. There is no bold/italic pair: a font asset is one file, so a bold face is a second
+**The frame is what is drawn.** The selection box, the click area in a running game and the
+camera's framing take the size of the text's picture (`setTextMeasure` in `bounds.ts`, set by
+`textPicture.ts`). Where nothing can measure — the unit tests in node — they fall back to an
+estimate from the character count (`CHAR_WIDTH`, `LINE_HEIGHT`).
+
+**Known limits.** Only text objects wear fonts; a sprite has no use for one. There is no bold/italic pair: a font asset is one file, so a bold face is a second
 asset.